ESA50 Long Delay

Hi, Here we go,
Back in December 2023 I completed a ESA50 to continue my IRESA, since then I have successfully applied for PIP , and awarded the enhanced rate in Daily Living, and Disability. Upon receipt if my PIP decision, I called ESA to inform them of my award and they then added Enhanced disability premium, and severe disability premium to my IRESA.
in the meantime I still heard nothing about my ESA50 form. Given the above I thought perhaps they decided that I did not need an assessment and put me in the support group, but no letter came to this affect. Now over a year later, and my having called DWP ESA, because of UC Migration, as I wanted to know what group I was in.

I was told the work group? I asked about the ESA50, and was told a manager would call me back, Which he did, He gave no reason as to why the ESA50 had not been processed, and simply stated that he could carryout a Deterioration Decision, protecting my claim from today. he was quite abrupt, and when I asked if the call was being recorded he said no, it was not. only incoming calls were recorded, not outgoing ones?

He said that an assessment was needed to decide if I should be placed in the support group, and being awarded PIP or EDP or SDP did not mean anything, or count towards a decision when it came to ESA50 or the support group. He basically forced me to accept a Deterioration Decision, stating it would protect me, and that I should still go ahead with my UC migration which has a deadline of 16th May 2025.

Now I am facing another assessment for ESA, and my form was submitted in Dec 2023, When I asked him if any monies would be back dated to the form completion date he replied NO, only until today 27 March 2025. I thought all monies we backdated? I told him that I would contact my MP as I was not happy. but now I am in a position that I have to migrate to UC by 16 May, and when I asked if I could delay it based on being in dispute in relation to ESA once again his answer was NO.

Sorry this is so long, any advice would be appreciated
Regards Navigator..

Hi David,
I had not heard of it either? The DWP Manager seemed to imply that this would protect me from losing out due to the delay in dealing with my ESA claim, which has taken over 15 months, it is not related to a sudden Deterioration in my health? My heath is worse but only due to age related conditions such as arthritis and a back condition. I asked for a copy of the Deterioration Decision, and was flatly refused, I think it maybe a sneaky way to avoid paying back pay because of the delay in dealing with my ESA50, I thought if it was the DWPs fault then back monies could be paid?
Navigator.

Thanks Gary,
I might just do that, but ive only got until the 16 may to get my UC migration submitted, but I do want to know what a Deterioration Decision, is and what it really means, so I can help anyone else who might get the same answer.